802.11ax: 2 MHz Channel for longer range

How can 802.11ax increase the range by using 2 MHz channels?
Are these WiFi transmission power limits always for a channel of 20 MHz? So I can increase the transmit power for a narrow 2 MHz channel 10 times?

By lowering the data rate.

read section 3.4

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Thanks. Some additional remarks:

Noise is distributed equally over the frequency spectrum. If you limit the bandwidth, you reduce the overall noise power.